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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f933e3c0e20a1158bdc80c5463a029583d70090b62029a250559c9d86000c148' 
  AND token = '16H18nqz9+BD2m5UobpaWkejWJRWkis6Y9zi9nK6TDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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