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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b17f05cb0743f77ac146384e23eeb561e95c11d4af1ca22c0f348a564c037fb1' 
  AND token = '+6t5Nr5MmIJpEMmlX6NQtooY3KJGJCblFzDuHcpMU2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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