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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6e6626433345faddfb013e2160ecb9c683b97c6fee2d0bdf8c2cc3ae7004541' 
  AND token = 'Zr+9HnOt2BzLu6iVbIpywvNwEFY3L6EwjD42zhMkVrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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