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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa04becce3cf4e90936928c1e874152a70315dafcf4d4f72c856dc2e8aacd7c4' 
  AND token = 'BW7YbM1jkr54q1xmXgpfiENz0PZrjoQeEnP9pX3mzX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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