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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17c2c0e6e98dd8fc3a01e92b0e3bfe2d08280ebab4220debb61e359873177d42' 
  AND token = '24gN1ndsvn9dgUSvh8jbpX3pQLRlR9fOVoJXw187Ero=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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