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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8682f14b6e400b44ed2538ce1ac76449e3ec6fa997fce4d5d99558b3289bcf3' 
  AND token = 'DiwU8gc7oPMas3EY6i+FFMj51v7VuXCieIqEiPG+xj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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