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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4789f9a2b60aa522b5ed18763e23a2c67cab287ea56da00d3cc5e02b0c0ab1ef' 
  AND token = '3/YbjM94ZeOf+un360KYX3sJqPouyId53w5IKRUBy9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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