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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '525e642526bd91e5e4a56cd730ff7a1485be358356ca9eeeeaeab69943bfba2e' 
  AND token = 'IDuB/RQCoA3U/S3E2VYGGGrQ1VlKmqp5e30j3JVNKI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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