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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f923a9874e5b3e60907b5d55e632590f19608af03084e51ffe6c5611da9c1c3' 
  AND token = 'EYn6T9GiWasXTlTkS/zvVl025456/m24aknhOfuaLz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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