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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bf6247ee44715466ce0df02c900dc99411346e92bf0f7578735e07c8e8f2b7c' 
  AND token = 'Bd9wJilN35IrP41HXktl0857QP9uRwbLoTXHxX6n/PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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