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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f944b8f350149f65ab09b33e6088efe9f0d382561f4a9e153495842bb36520c4' 
  AND token = 'R3fI1QdrrwvS4NMsJgb8CGgNfoQOWSNidw5uhcGO7KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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