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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e22dc5e4cc537257a16ad3c08daa47a25bd97b56a7a4354a05a6c69e2f84cb15' 
  AND token = 'i+/3b+FsneheN4S0XQYiuclUdeOU9PN1OCpVkJztnuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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