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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '607e42961e8008ddb79bf0cbaf70503ba0a134b75f2dd9ccfca73e5ede932000' 
  AND token = 'bZhhPyMjFcg7B0VZD04yxoh0zwmLtm0vsfDiJjLk+5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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