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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '610502c61127f995ebe49fa56546f3409c51e76696396280e52bea179b9d66b4' 
  AND token = '8MQOvY5whyeEkiJOaj2CojcoaoevNgG+LLdS74KWP34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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