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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52668d6eaafd4c9bc86a88dc9f1708c21e4e46bcd52fb751e8bf67325b42ce6f' 
  AND token = 'Rg5I8Iux5kkYAxRTj0a4RuYLliGOPnWka+NMJAV4ejw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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