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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9baae21a6d3bbad442f2b2c13e797da809c1780595adeb88a7e2e8128139b5f' 
  AND token = 'd4a3BssCqeOz63FrLpsQfKUNna2DyJicmGIKk6kWTv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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