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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4a1e00a39b3b23bb04f45a40e1d0d1d96c64f1ff0407fec82bc0b9a0c39f4bf' 
  AND token = 'Tf+GAwb5QywWvBSdFaV8rYhuG9ot2viwHpQVSSMx1Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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