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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7dd2a89577b993f97843e29d7b2df7d8f5a0abf01716243bb907055ebf1b3b5' 
  AND token = 'fTZtToJaGHfsBtB0+nDqab0MYRGmLorFjN3dNB9qNuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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