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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14119c560094586cd424bac37013e5a216bba27b929415145ee585752360892c' 
  AND token = 'sojYWwpAM6H9FzS4EUG2imrHg+qDxrGvbKfeqTb8420=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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