SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b5ae8a4275dd2458f636b122bcd2c9be4f286b03112397cae5f5b4d465b04a8' 
  AND token = 'gOfR8U/5kvXzp7gQgBzhwVlQxE0x9zl4RhpEuWhNBvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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