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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7486fff16ec5f446b11bfe8a3fb788cfe56ac1775001910c05ef617fd943dd8' 
  AND token = '/oRJt6bN4f4sh79YdhpWl6TiTkXbFlTVePU5MivatJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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