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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ddd4e5818ff2ae0dd109d87c0013ab5d802474b8a2f9a14052ffc6098218f7c' 
  AND token = 'KBklfoO1LfkhsxijNezVgHk9DA1VuYkyL0BiFH77iKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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