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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4463883d064eae0bb0d201615e3cfa2773da8be908ed99b23a52124d33eefe1a' 
  AND token = 'p4+S/HU2sR53/8TQOOyLx/ZYom9Gb3gJlm4dhqWzC0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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