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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9950b2431b647fec53ba9234fef48effb3df4fcbe87e6082ba76b1817ed8581a' 
  AND token = '8i2HLYdqwr3d9scEqwh87+QoqAnkMPQ5SPnBOWln+FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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