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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad0cca4a39272d06751fbe5075d5f722595d57cb286cec28ac07b803c4c243e1' 
  AND token = '7XmME8JTvM25guReihSDovpyDhc/SyOJCgEjkK39F2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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