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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09477f7d208818e0c437e48c12c2fd5231004dbc1502436edcd1c7b20b1abd9e' 
  AND token = 'yO1zlrLqowUtdUDKCpe3BSI2Cxf+DjUJWyb6TZBGZO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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