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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0890031805fccead164468e9d2b30c52ec61d20fa816efb5e871c58830dc5813' 
  AND token = 'DREj05sxAsvHuYnUL2/BuEU1fj2Q8G3aTO/WYFh05Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}