SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c158867b9a19dc1d01e92129abda7597c31db259bb8cacfb1b846fd1de4cf854' 
  AND token = 'Bo1DDFP3z3blu+DYKRlPMGhjkIRaga54vF3pjLES/n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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