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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '651ccb2ea1404ca30cf55ed8015438976b28a37669a869f7c62b776bf9ccdb06' 
  AND token = 'houj6nY+wE3EbHoNy1BOj+i6scQrtkA/mpyUTQ7J/r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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