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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '237dd6272079d5c0c7d43160ff1854cab0048777c916dec80696fd85b6961f47' 
  AND token = '05gwOC4EgyEehXwXQivySWMtoj2x5tuRSkGPEwdQmGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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