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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7c77520d73ed444d65369dc41898bea4427fffc439476d35f5b93600441cb53' 
  AND token = 'KpdWm2t/WRHdWgWSO5Ul0Jsr7WbWw2rUHYc9UGF1MSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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