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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c6085e57a9a2fc53df8f60c20c02511476d829524b34ce145d108db5ad3de5b' 
  AND token = 'aVKF94xpJlh96XoSm1i5S/LbrcLe0xs55F8lEBpUB8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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