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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7056eddf58312ebeeeff7c2fe206ac62e2a452867aea665086d2c8759e4c9e2' 
  AND token = 'MhtByByxdoLNW1pBM2/Lh71cxJfCScutmPYwyrbY6DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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