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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e68f344ea060bc1e0d4b4c9e9c127721e006da03ab451cfef52ab49341d471b1' 
  AND token = 'imW4QZvy3c/e75l1Z4XgLwcXZ8vgKXt7ekwlpvjrWvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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