SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cac84936d461e5c1729b77a8de5279363bd7bf5ee97e44f8e2ce29bb71231c16' 
  AND token = '7wquw2bThLzkDpqE5GJgFY+n+8soEMx4DvPxLr4Sf1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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