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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '126a6c74200babbda284438120a885a9d10d552c00fd390c01dc13d9e6b77236' 
  AND token = 'JTIATg+BCoTQquxoCxf+80Rf6u1EyC7B+IUcVrG9ghs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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