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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fdddde58b3be56090ce1ba784e21c8b36eb97d8b2327b65a94afc703b6ea2ff4' 
  AND token = 'eL+02T1rPXfcNCmoV3i+80gIxXS3AhiBV3EBlDsdgls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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