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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad93d6e8dbaaf0e137cf4e1b49aeaec99c286f8acbbd95a76bf7baf3b6084e16' 
  AND token = 'Np/v4dmQGkJiH81SSrx+m8Tqxo3Lr8ncCI1Jdk1Sxcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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