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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7bdd8a819809ec8939eae62d5fe4221d2ce84d14914a5a580f99a36ec89e5d81' 
  AND token = 'VRs3O6b3/sH/D62LRndmLF+z1BafKyutApZGmvX30nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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