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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36a33c1f9e76bbf93c0d3a615e55fab85e1da8be1282aa7724e988567b6c1b28' 
  AND token = 'IdUv+aNX6rPBj+Ng6Kub+fc33MvvJ7NAoSoYm928a5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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