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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ae92534ae51df80f1e35f385611986316db2554c992f5e5dbda83644fc24be1' 
  AND token = '3oR3rKgFd3Lcz8nct64erD1muizBXB9q3n8yGoQWvao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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