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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'caac42f75bff3bfad49a77c3a3edba6cfc7caa963ed59815c3b9f2b9737f6f92' 
  AND token = 'Ww34PUG+HzRLHhJ9x7G7FSDSJ1DwRVNoAclSRqKRgVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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