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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7abfc0f761b8792bd7c93d8a45777a10d1d55b11e0bf2f103031ed864e9e9a62' 
  AND token = 'U4fe+sm5yUxON93A9g60rDoLoPEwq27CRzLRu6QfCYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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