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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9763efd3b03dda81ae37708bd9d0195cde079f4c98f945d8710075149107c4c' 
  AND token = 'WKFbMzp/geGkDe7E7+nwj/hGJlRZoa4PaA7pVUZL3b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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