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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '993c8d48c9ee7eefc5fb20b4a317f71c5ec2772bf879fd65188b2d11dd775182' 
  AND token = '9tP8qD3WzWjd+MaADODH9wrOYeXr5AVV1NNMFMX7elA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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