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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70321cfe1ff9c4a965c4767c6445abddac0d3c9ce5eefb8fd096e434cdf0767c' 
  AND token = 'zdjgEN020Hon1Z0myuTMvnXYdFNaP6HckhNfW35V+bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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