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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c91214d7348cdc781034f270a22ef788f43bb6091f3065bc8b30c894f1790f9c' 
  AND token = 'xu0xl4Z4hzxhSN25jHkXfbOb0V3g8/ee8FExW0GyE7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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