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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3547151a64e02a8d8fee7ba66be7092568755d5fdf6b0ca1dfdc8b45e6983c2b' 
  AND token = 'Ir+DzPmSQy85L470LfLXGB0e+LLlchiUXUlXJun3MZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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