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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c06d211226b0b97cd9c74d47a9bfb3b47f3fa4e57a7fd030a38ae0752fd19f92' 
  AND token = 'vn/Uk6Q4U9NSZ/eYIDkSd8j7kxuziyhDypNR46KZRBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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