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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82a25c96b0540d5131c6bf8cac09fe76fa4233102a45b6c71d5c7a61e0da2175' 
  AND token = 'Ry6LsMpXWNE9hyRmvFT6kj+07JeFOyRCJHhilYUwpTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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