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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15c1f7a0dd9da1de0560cf815bc3846385b72343796a1b7afc25ded364803262' 
  AND token = 'jb2F6Ia+UR55j11BgeTslp6kkWKLVESCeV+scH+0xtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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