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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14047edea1889709dc53b25f8f30978e4e80cafd67780733f40abac0d1d8977b' 
  AND token = 'y0OkksNuhz0scb4U489ECWjHvyclJHygqgScYnW3sfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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