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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f51a02bae2ea72995363cedb3e275a370f2f36191aa726f7c2a3b4adc8f7f94' 
  AND token = 'K/GfSeaNCQTvnPCFOgF6Vc3GZ6z7k3sPY+NofTywXM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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