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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57b5092b7b068f947adfdc63ae8ab299dea564304cf7e576b6a1b257fa222d25' 
  AND token = 'HMHX/Mk6cB24aOB3C6dEqPI6SdjamYfwANWteb1EBTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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