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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6126a38d3b10a03747e2eae7bab8c7287ecbb51e5dec5f3670b72b4170d9c924' 
  AND token = '+ou2p34lwgOD7TsGpzZTAAdmCtcw07SnkCwCQ/yfgck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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