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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1e0e7ab0b7779ee1708dc97949e5ff9adbeace93e631de8324e729e7d402694' 
  AND token = 'Qvpf0V1q+dHrO028cGDC0rijNFcCI7nAvsbDJAoA87A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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