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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e447fe49c26475853364d9eb06fb4f72cc3b64ca8dfe0b6ba48ba78d94a13c2' 
  AND token = 'hf2AgT09cP0y1kGPpydljLI3e4SPtI+EfNp3rAhtWxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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