SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fae3c0a1a355c6238314d749bd821034129fdfe8d4f379173d0801f37ebec4a6' 
  AND token = 'CeV5uHXvOC0+J9uCmzIQlOLQl8QSnOFfQtWYbEG3IHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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