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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0eae7594fb43813f9d06cf698dcd51eb073093d85d80a029c5335e88cfd6daed' 
  AND token = '1SiaUxaDQo6VS64GE438QTAvAGiZ8RXtwR+p+MHx5oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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