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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '351980abc1f37b9aee38e4e834718123098cbc137dfbad832d039aea3971b96b' 
  AND token = '9OxRWLC0ucBIB67XZKUEkzgXH84YAzfKrbDb29e7cNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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